D1 Microbeam option

Using single-bounce x-ray focusing capillaries from Don Bilderback's group, we can focus the D1 beam down to 20 microns. The beam divergence can be limited by accepting only a part of the accepted annulus by using a set of slits upstream of the capillary (see Ruipeng Li et al, J. Synchrotron Rad ...).

We are developing a capillary stage that can be moved into the beamline relatively easily . Working distance, i.e. distance from capillary tip to sample is typically 55 mm for the 8 mrad capillary.

A far-field camera, about 500mm from the sample is used to align the sample (see Sterling Cornaby, Capillary handbook(

Essential for work in grazing incidence is our polished Cd tungstate crystal and the sample microscope; this way the focused beam can be characterized in situ.

Microbeam scattering is still considered to be an expert technique at D1. Hence users requesting this option must be willing to devote a larger part of their beamtime for line-up and to gain expertise in re-aligning the capillary.